I have a PC and a Macbook. I installed Adobe Digital Editions (ADE) in both and downloaded a book from google (https://books.google.com/books/about/All_of_Programming.html?id=-zViCgAAQBAJ) onto both machines. I first added the book to the PC in ADE without an Adobe ID and was able to see the book on the PC. Then I tried to get the book on my mac but got the error in the title of this post:
Unable to download
Error getting License. License Server Communication Problem:
To try to solve this, I tried deauthorizing the PC but that didn't help me get the book on my macbook, and now the PC ADE gets the error message as well!
So I can't see the book in any platform of ADE. All I want to do is be able to access the book offline (because google play books doesn't have any way to do this in their chrome app). But I haven't been able to do it at all with ADE.